Did the Romans ever conquer Scotland?

The Romans got as far as Inverness in their conquest, and subdued the Picts. They realised there was little beneficial for them in Scotland. A major battle at a place called Mons Graupius somewhere in the Grampians defeated the tribes but was not followed up (see link). Roman forts litter southern and middle Scotland. The Antonine wall was also built across Scotland between the Firth of Clyde and the Firth of Forth. Originally planned as the same construction as Hadrian's Wall in the north of England which it was intended to replace as the frontier of Britania it was modified to be built of stone topped with turf with forts along its length. More forts were built north of it. The Picts were fierce warriors and the benefits did not justify the negatives. It was not that they couldn't conquer Scotland, but chose that it was an unnecessary venture - not easy to govern and little reward in taxation. They were not unnecessarily expansionist.